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Ethanol-free gas is the only gas I run in my three lawnmowers. Good stuff.
Several lawn-mower mechanics recommend it too, especially if your lawn-mowers "sit" over the winter.
They start right back up in the Spring when I leave ethanol-free gas in them over the winter. Not so much with ethanol gas--something about the ethanol separating over time and doing bad stuff to the carburetors. Costs more but well-worth it.